[tests] Only acquire lock once in p2p_compactblocks.py

Author: jnewbery

test/functional/p2p_compactblocks.py

@@ -305,10 +305,9 @@ def test_compactblock_construction(self, test_node, use_witness_address=True):
         self.check_compactblock_construction_from_block(version, header_and_shortids, block_hash, block)
 
         # Now fetch the compact block using a normal non-announce getdata
-        with mininode_lock:
-            test_node.clear_block_announcement()
-            inv = CInv(MSG_CMPCT_BLOCK, block_hash)
-            test_node.send_message(msg_getdata([inv]))
+        test_node.clear_block_announcement()
+        inv = CInv(MSG_CMPCT_BLOCK, block_hash)
+        test_node.send_message(msg_getdata([inv]))
 
         wait_until(test_node.received_block_announcement, timeout=30, lock=mininode_lock)